Jan Hendrick Neuman ( 1819 - 1898 ) was a German painter. Jan Hendrick Neuman s works have been put up for auction numerous times, with realized prices varying from 879.1 USD for Portret van Casper Hendrik Kuhn in 2005 to 908.3 USD for Portret van dr. Casper Hendrik Kuhn in 2014 , based on the size and medium of the artwork.